Reddit's /r/participants

[electrolyte]

Reddit has a subreddit where researchers can post their surveys, looking for participants: http://reddit.com/r/participants

Most of it is unpaid so I ignore those, but sometimes there will be surveys with Amazon gift cards or PayPal payment included. I watch for those. They go quickly, so you have to jump on them right away when they're posted!

 

[electrolyte]

This subreddit appears to have closed. They're now directing people here instead: https://www.reddit.com/r/SampleSize/

 

[Achilles2357]

This subreddit appears to have closed. They're now directing people here instead: https://www.reddit.com/r/SampleSize/

I was looking around and found:
https://www.reddit.com/r/paidstudy/ (This one seems reasonably active.)
https://www.reddit.com/r/PaidStudies/ (This one isn't as active, but it seems new stuff does sometimes appear here.)